Compilare: user.c: In function 'cmp2': user.c:59: warning: unused variable 'j' user.c:59: warning: unused variable 'a' user.c: In function 'put': user.c:73: warning: unused variable 'b' user.c: In function 'solve': user.c:128: warning: unused variable 'j' /tmp/ccxIj6Ij.o: In function `main': user.c:(.text+0xe52): warning: the `gets' function is dangerous and should not be used.